SERVE AND VERBAL VOLLEY

Djokovic bust-up with gobby fan as pundit Kyrgios offers to jump into the crowd and 'sort him out'

- YASMIN SYED

NOVAK DJOKOVIC accused a heckler of "crossing the line" during his second-round win over Alexei Popyrin yesterday.

And pal Nick Kyrgios threatened to "go all WWE" to sort out the unruly spectator at the Australian Open.

Djokovic survived another tough test in Melbourne - three days after he played a 4hr 2min thriller in the first round.

The defending champion dropped the second set and saved four set points in the third as he beat Australian Popyrin 6-3 4-6 7-6 6-3.

The turning point for the top seed came at 2-2 in the fourth set, when someone in the crowd started heckling him.

Djokovic confronted the spectator and dropped just one more game afterwards.